tests: use the proper assert methods
tests: use the proper assert methods

The tests for the tosca_compute module were not using any of the
defined assert methods for testing the correctness of the expected
results. The code can be easily refactored to use assertDictEqual
instead of checking dict item by item.

Change-Id: Id23490fdedc5a6dfa471b7176bd2a04bd43e5d8d

openstack/heat-translator,openstack/heat-translator